---Look! The light is still on. Is Mr Wu working in his office？
---No, it _____ be Mr Wu. He has gone to Nanjing for a meeting.
| A．needn’t | B．mustn’t |
| C．can’t | D．wouldn’t |
---Look! The light is still on. Is Mr Wu working in his office？
---No, it _____ be Mr Wu. He has gone to Nanjing for a meeting.
| A．needn’t | B．mustn’t |
| C．can’t | D．wouldn’t |
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